I just went to Hong Kong and checked out some computer stores. My favorite one was in the Wan Chai Computer Center. It's right outside of the Wan Chai MTR station. There's 2 stores in there, both on the 2nd floor. The best one was called "New Task", I think it has a diff name now. You'll know it because theres Filcos, Realforces, and other gaming keyboards in the window and the shop is tiny. Shop owner doesn't speak a lot of English but you can haggle a bit.
There's also two places near the Shum Shui Po MTR station in the
computer center there. Tokyo Computer Accessory and Cosmic. Tokyo had a lot of TThermaltake and Chinese products. Cosmic had a lot of Ducky and other gaming (Logitech, Razer, etc) stuff. I liked Cosmic more.
I'll warn you right now, Shum Shui Po gets REALLY crowded while Wan Chai barely gets any traffic. And I like the Wan Chai place more. And perhaps you can get some pictures because I didn't get any
.
TL:DR, if you have to pick one place, go to the Wan Chai Computer Center, 2nd Floor, and visit New Task. That place is awesome. I've never seen a store like it. Cosmic is pretty good as well. And I didn't get to go to Keyboard Hell I don't think. I might have wandered in at the wrong time since the hours of the markets are weird.